examples/DCP_analysis.ipynb

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      "expression curvature = ConvexVexity()\n",
      "expression sign = Positive()\n"
     ]
    }
   ],
   "source": [
    "# DCP analysis in Convex.jl\n",
    "using Convex\n",
    "x = Variable();\n",
    "y = Variable();\n",
    "expr = quad_over_lin(x - y, 1 - max(x, y));\n",
    "println(\"expression curvature = \", vexity(expr));\n",
    "println(\"expression sign = \", sign(expr));"
   ]
  }
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